Molecular Simulation Results on Charged Carbon Nanotube Forest-Based Supercapacitors
- Tulane Univ., New Orleans, LA (United States). Dept. of Chemical and Biomolecular Engineering
- Elizabethtown College, PA (United States). Dept. of Chemistry and Biochemistry
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Biological and Engineering Sciences
In this paper, electrochemical double-layer capacitances of charged carbon nanotube (CNT) forests with tetraethyl ammonium tetrafluoro borate electrolyte in propylene carbonate are studied on the basis of molecular dynamics simulation. Direct molecular simulation of the filling of pore spaces of the forest is feasible even with realistic, small CNT spacings. The numerical solution of the Poisson equation based on the extracted average charge densities then yields a regular experimental dependence on the width of the pore spaces, in contrast to the anomalous pattern observed in experiments on other carbon materials and also in simulations on planar slot-like pores. The capacitances obtained have realistic magnitudes but are insensitive to electric potential differences between the electrodes in this model. This agrees with previous calculations on CNT forest supercapacitors, but not with experiments which have suggested electrochemical doping for these systems. Finally, those phenomena remain for further theory/modeling work.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Tulane Univ., New Orleans, LA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE Office of Science (SC); SNL Laboratory Directed Research and Development (LDRD) Program
- Grant/Contract Number:
- NA0003525; AC02-05CH11231
- OSTI ID:
- 1474079
- Report Number(s):
- SAND--2018-10191J; 667946
- Journal Information:
- ChemSusChem, Journal Name: ChemSusChem Journal Issue: 12 Vol. 11; ISSN 1864-5631
- Publisher:
- ChemPubSoc EuropeCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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